Fixing device of waist

A fixation device for waist, comprising:

• a) a back piece;
• the back piece comprising a cavity and a filling port;
• b) a first elastic band;
• the first elastic band comprising a first end;
• c) a second elastic band;
• the second elastic band comprising a second end;
• d) a first fastener;
• and
• e) two wing pieces;
• each of the two wing pieces comprising a sealing cavity and a supporting bar;
• wherein:
• the back piece is adapted to cover a posterior side of the waist;
• the first elastic band and the second elastic band are respectively connected to two sides of the back waist piece;
• a first piece of the first fastener is disposed on the first end and a second piece of the first fastener is disposed on the second end to connect the first end and the second end, for keeping the fixation device wrapped around the waist;
• the cavity is arranged in the back piece;
• the filling port is arranged on the back piece and is communicated with the cavity;
• when in use, polyurethane slurry is injected into the cavity through the filling port, after the polyurethane slurry enters a solid-phase softening section, a shape of the back piece is matched with a shape of the posterior side of the waist;
• the two wing pieces are respectively disposed on outer sides of the first elastic band and the second elastic band;
• the sealing cavity is arranged in the wing piece;
• and
• the supporting bar is placed in the sealing cavity.